Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7f82ab51095048…

MALICIOUS

PDF

84.1 KB Created: 2021-07-02 04:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa3916afa75f21abc6d89734dcf0d221 SHA-1: 5e6cf38199e4261ee02ab51684c607bb31b1defa SHA-256: 9b7f82ab510950482c81484a0217849f1cf16b15d00ac3fa2ca030481eb28e68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=thank+you+for+the+blood+lord+lyrics
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/5098c75a7b63ed96fc7b4c11320bae08/fanukilamikadimiga.pdf
    • http://aarogyamedico.com/userfiles/file/20146283820.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ee7adafe---jusor.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/07378187ab6fc9788a37f8c3f27a1359/fawuwatese.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a78e51420eb6999b6678348d20bc5e9a/fajupunejebabopafimaxevav.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d820b1ca6---89448091096.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5170885b11---lupiwoganatojiban.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f7cd1511d1aadd179284dcf7a53bacc4/sidatig.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/9ekhsot42crelt60rvra6s7e2u/gawekepilebefunagijazoran.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608622ce7fbf7---jusegigupojogikopakewofe.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wamifimoziga.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16079096085dba---51296845216.pdf
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/subituwifesetigu.pdf
    • https://igruppe.no/ckfinder/userfiles//files/xatenebagukukexuzumo.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5e64cbf35---zisazu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3lna6gc8rrp008j7e2omue84u8/dazubevesim.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7aae38d75---70766290909.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a57733be912---88262641629.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/814bca174c68ac9ffc475edd85d0b2a6/95330172179.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/945d245b80ecd54e37b96fb279c3e207/zaxomepimofizof.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba81bdc01a---51430174840.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/gewapa.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070822837979---nujakeforifinakebemoposa.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fc789b4c854a0292016a9302dc8ea935/36640039281.pdf
    • https://soalmatematik.com/userfiles/file/43750196487.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d5.bin
77e4c0a358a2d06e7882882d130eb5a70007b259ad9957568ce7af545d8ccbf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 10984 bytes
font_01_sfnt_off0000fa43.bin
b521b504c3405227e8aac8f8fdc77fef3d401d764c8107ecb628a465aec29091
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 18296 bytes
font_02_sfnt_off00012964.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes